There may be no single cause of bipolar disorder (aka manic depression). Instead, research indicates the causes of bipolar disorder are probably a combination of biochemical, genetic and environmental factors that may trigger and perpetuate the chemical imbalances in the brain.
Net worth: $829 million. Telecommunications mogul Strive Masiyiwa is widely regarded as the richest man in Zimbabwe and is one of the richest men in Africa with a net worth of more than US$800 million.
Apart from them, there is no other black woman in the world who happens to be a billionaire. While Oprah Winfrey is richest Africa-American billionaire, Isabel tops this list and she is also wealthiest female billionaire in Republic of Angola. These three are the only richest black female billionaires in the world. Must Read: Richest black man #1) Isabel Dos Santos â The Richest Black Woman in the World 2014 This article presents the richest black woman in the world for the year 2014. Of all the black women on Earth, only two were billionaires in 2013 but now there are three. The new entry is of Nigerian oil tycoon Folorunsho Alakija. While the other two are Oprah Winfrey and Isabel Dos Santos. These females found a place in Forbes Billionaires List.